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      4-ton central heat pump · DRU Series

      DuraSTAR DRU1U60S2A

      Below average cooling efficiency and average heating efficiency for a 4-ton central heat pump, and certified for cold climates.

      Ranks #206 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,542 a year to run in a mixed climate like Atlanta.

      SEER2
      16.2 Cooling efficiency over a season
      Below average · beats 36%
      HSPF2
      8.6 Heating efficiency over a season
      Average · beats 45%
      EER2
      8.9 Cooling efficiency on a 95°F day
      Below average · beats 3%
      Heat at 5°F
      40,000 BTU/h78% of its 47°F output
      Below average · beats 5%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 40,000 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • Cooling cost matters most - its SEER2 is below average for central heat pumps.

      Calculate my running cost

      Details

      Specifications4 ton, R-454B
      General
      BrandDuraSTAR
      Also sold asThermal Zone
      Outdoor unit modelDRU1U60S2A
      SeriesDRU Series
      TypeCentral heat pump
      Nominal size4 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceDecember 8, 2020
      Last certifiedMay 1, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better16.2 (range 15.2-16.2)
      EER2Efficiency at 95°F outdoors8.5-8.9
      Cooling capacity51,000-54,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.2-8.6
      Capacity at 47°F47,000-54,000 BTU/h
      Capacity at 17°F32,000-36,000 BTU/h
      Capacity at 5°F38,000-40,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80
      ENERGY STAR cold climateYes
      Heating output as it gets colder78% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with DRUC6021S2A at the standard test temperatures, in BTU/h:

      Certified matchups9 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      DRUC6021S2A · cold climateS9V2C100U5VS***16.28.98.538,000218071899
      DRUC6021S2A · cold climateS9V2C100D5VS***16.28.98.538,000218071898
      DRUC6021S2A · cold climateS9V2C080U5VS***16.08.98.639,000218071897
      DRUC6021S2A · cold climateS9X2C080U5PSB**15.78.58.238,000218071983
      DRUC6021S2A · cold climateS9X1C080U5PSB**15.78.58.238,000218071903
      DRUC6021S2A · cold climateMGV96U080C4C15.58.58.640,000218071734
      DRUM4260S2A · cold climate-15.28.68.438,000215374897
      DRUC6021S2A · cold climateS9X2C100U5PSB**15.28.58.238,000218071985
      DRUC6021S2A · cold climateS9X1C100U5PSB**15.28.58.238,000218071905
      Same unit, other model numbers1

      These model numbers have exactly the same certified ratings and matchups as the DuraSTAR DRU1U60S2A: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

      Yearly running cost in 10 large cities$1,472-$3,608

      At each state's average electricity price and the city's typical heating and cooling hours.

      Questions6
      What is the SEER2 rating of the DuraSTAR DRU1U60S2A?
      The DuraSTAR DRU1U60S2A is rated at up to 16.2 SEER2 and 8.9 EER2 for cooling and up to 8.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 9 certified matchups SEER2 ranges from 15.2-16.2.
      Is the DuraSTAR DRU1U60S2A good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 40,000 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
      How much does the DuraSTAR DRU1U60S2A cost to run per year?
      At its rated efficiency it costs about $1,472-$3,608 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,771 in Phoenix and $2,979 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the DuraSTAR DRU1U60S2A the same as the Thermal Zone TZID60H520ZCS?
      Yes, as far as the certified ratings go. ENERGY STAR lists both model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.
      Which indoor units work with the DuraSTAR DRU1U60S2A?
      ENERGY STAR lists 9 certified combinations for this outdoor unit. The highest-rated ones use DRUC6021S2A, DRUM4260S2A.
      What refrigerant does the DuraSTAR DRU1U60S2A use?
      It uses R-454B.

      Running cost and savings

      Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

      Heat pump $1,733/yrYou save $847/yrSee details ↓
      1. Where you live
      Adjust heating and cooling hours

      Filled in from your city's climate. Change them if you run the system much more or less than usual.

      2. The heat pump DuraSTAR DRU1U60S2A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,733
      Current system, per year
      $2,581
      You save per year
      $847
      Payback
      22.4 years
      Net after 10 years
      -$10,527

      Cooling $1,108Heating $625Electricity used: 10,833 kWhSaved vs. a minimum-efficiency heat pump: $239

      Estimates use the unit's rated SEER2 and HSPF2, full-load hours derived from NOAA 1991-2020 degree days, average residential electricity prices from the U.S. EIA (12 months to July 2026) and fuel prices from EIA (2025 for natural gas, week of 2026-10-05 for propane and heating oil). Very cold days that need backup heat are not modelled. Federal minimum for comparison: 14.3 SEER2 / 7.5 HSPF2.

      Similar 4 ton models

      See all 319 4 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 1, 2026. How we use the data.